That is a tip that I wouldn't mind knowing myself given that I will be putting the car through its drag race paces on October 7 at our Atco private rental day

 

Hmmm, I guess is why they post both results, with and without the other stuff.

http://www.fvd.net/de/en/Porsche-0/R...o_S_2014-.html

http://www.fvd.net/us/en/Porsche-0/S...__630_HP_.html

 

Are you going to use street tires or R compound tires or drag radials? I don't want to put R compound tires on the car because I DD it and Karl says he does too but I read they are not safe on wet roads.

 

Imagine that. FVD claims that their parts make power. No conflict of interest there.

- Patrick

 

What conflict of interest would that be? Are they lying? Is that what you are suggesting?

 

Probably my Pilot Super Sports.

R compound tires have an increased risk of hydroplaning in rain especially if there is standing water. I would not DD them here in New York.

 

Yeah, I wish I could get some PSS but they were out of stock when I needed the replacements. I am just going to try EcPChris recommendations and hope for the best. If I can get below 10.5 I will be happy.

 

I got them from simpletires.com

 

I'm looking at sport cup 2s.

Any reason not to DD those?

 

MPSC2s are awesome on track in warm weather but not good in cold or wet weather. There is an increased risk of hydroplaning especially in standing water. Here is Tire Rack's warning on them:

"Warning: Pilot Sport Cup 2 radials meet DOT requirements, however they are not recommended for driving in wet conditions where standing water is present and there is the risk of hydroplaning; drivers should drive cautiously at reduced speeds if they encounter these conditions. This is especially true of shaved or worn tires. And like other Streetable Track & Competition tires, these tires are not intended to be stored, serviced nor driven in near- or below freezing temperatures, through snow or on ice."

If you drive in the rain with them slow down especially if there is standing water. All R compound tires share this characteristic.

 

I didn't realize SC2s were R compound.

I ordered PSS instead.

 

The Pilot Super Sports are about as grippy a tire as you're going to get while still maintaining excellent rain traction. They are much much grippier than the stock P Zeros were in my car. The stock P zeros absolutely could not handle the added power of the GIAC Stage 2 in my car. The test ride I took at Champion with the new intercoolers, GIAC Stage 2 plus, Tubi catless race exhaust with P Zero tires was scary. At WOT from a stop the P Zeros could not handle all that power, requiring to driver to make lots of steering corrections to keep the car straight. The PSS's are a better performance tire.

 

In addition to dropping psi to 32, what advice do you have in regards to warming the tires before a run?

 

In all reality, we're VERY happy with the results we're achieving with the Stage 2+ package. 45 lb/ft of tq is a massive peak gain for simply adding intercoolers, especially considering gains are higher in certain points of the curve. And the most important part is that these tests were done in our 100 degree dyno room and using 93 octane pump gas with NO power adders whatsoever. More importantly, on back to back runs, gains were consistent, IAT's stayed extremely low, and the results were repeatable. Also keep in mind that we are able to run this software package on SDG's car with a catted exhaust. On a catless setup, EGT's are much lower and we're able to push it even a little further. So, all things considered, I think it's a big success.

As for the IPD y-pipe...I agree it's a shame it doesn't fit, as we've always been a fan of IPD products and endorsed them whenever we could! Unfortunately however, as we're two separate companies, IPD does not involve us in their design meetings nor do they share their future product plans or designs, and vice versa. We will have our own carbon fiber y-pipe available within the next couple of weeks, which will complement our intercooler kit perfectly for those that are interested. The prototype is currently installed and being testing on our car.


While I can certainly appreciate your opinion, I have to state the obvious here. I have never had anything but fantastic things to say about FVD and their products.

That being said, SDG asked me to perform this test, and we did. Same day, same fuel, same car, same dyno. We even attempted to adjust the software to accomodate the headers and write a custom tune for the headers. If you're going to suggest that GIAC couldn't write appropriate software for the headers then...well...just don't go there. Unfortunately, the losses we observed were real, and simply could not be overcome. If you add the headers as part of a complete package, would you get more power then you started with? Yes, of course. But our findings clearly indicated that removing them yielded a better result. We had absolutely nothing to gain by doing this test, since we don't offer a header for the 991 Turbo yet. In all reality, I was HOPING they would make good power, because we could then offer them as part of our kit and help support our friends at FVD.

In SDG's case, the goal was to complete a very thorough and methodical before/after comparison of his car as it arrived at our facility, and when it left. As is always the case when we use our dyno, peak HP and TQ numbers are not really our concern. What we look for is the delta between changes to the car. Clearly in this case, you can see where and how his car benefited from the additional mods. Since SDG has mentioned it a few times, I'll post a copy of his dyno results. For referrence, the temperature in our dyno room on this day was 94 degrees, and all tests performed on his car were done with 93 octane pump gas only. NO race fuel was used. I will not post the dyno sheet for the headers, as I think that would be in poor taste as a vendor. If SDG would like to post it, that's entirely up to him.

The yellow lines represent the "before" and the blue lines are the "after", with the intercoolers and updated software being the only changes.

 

Here is the dyno run of my car showing FVD headers vs stock headers. I would not make an unsubstantiated claim.

Generally FVD has an excellent reputation and perhaps their headers gain power when used with their tuning products and their other mods. I just don't know. I have listed my car's specific mods before in this thread.